Portable cutting and breaking machine



Nov. 23, 1943. w. v. CORNETT PORTABLE CUTTING AND BREAKING MACHINE Filed April 26, 1941 3 Sheets-Sheet l INVENTOR.

Hi l m v n m fl m 23, 1943- w. v. CORNETT PORTABLE CUTTING AND BREAKING MACHINE Filed April 26, 1941 3 Sheets-Sheet 2 INVENTOR.

J1 TI'ORNEY'S WHLTER VLEQRWETT BY UM W. V. CORNETT PORTABLE CUTTING AND BREAKING MACHINE Filed April 26, 1941 3 Shee'ts-Sheet 3 BY HTTORNEYS PatentedhNov. 2 3, 1943 UNITED PORTABLE G AND BREAKING MACHINE Walter v. Cornett, Brooklyn, N. r.

Application April as, 1941, Serial No. 390,407

, comm. (cuss-. 13)

This invention relates to a portable concrete cutting and breaking machine pneumatically operated, either in the hand push or motive power driven type. A salient feature of this invention, is the swiveled front and rear wheels of the hand push machine, either of which are independently operative to each other, in order that the machine may be maneuvered around so the front air cylinder driving the hammer head and cutting tool may turn in about a radius of four and one-half feet, thereby operating on a range of nine inches up to nine feet or more. I

Another salient feature of this invention, is the flexible suspension of the air cylinder and its tool driving mechanism by means of a clevis member secured in one of the ends of a bell-crank Figure 3 is an elevational-sectional view taken on line 2-2 of Figure 5.

Figure 4 is an enlarged detail view in elevation and partly in section taken on line H of Figure 2, which shows the cam and clevis connection for the suspension of the air hammer cylinder to the boom of the machine.

cam pivotally mounted into bearings oi a proiecting arm of the mast-boom having a turntable base arrangement for swinging the arm and air cylinder in a circular direction of about 180 degrees, or 90 degrees to the left or right oi the center line of machine. The crank-mam also provides means to lower the air cylinder and cutting tool to a lower working level, if so desired.

Another salient feature of this invention, is the optional use of either type of a power or hand push machine, in which the same concrete cutting and breaking mechanism may conveniently be installed, and the driving hammer head is adaptable to have interchangeable tool members for any kind of cutting and breaking up of concrete floors, or the like.

A further salient feature of this invention, is that the hand push machine may be so designed to provide a pointed or an apexed front portion Figure 5 is an enlarged sectional view taken on line H of Figur'e'2, showing the booms worm-gear swiveled connection operative onto a turntable supporting base.

Figure 6 is a side view in elevation of a handpush type concrete breaking machine that operates in a very small space. i 1

Figure 7 is a plan view of the same concrete breaking machine as shown in Figure 6.

. Figure 8 is a view in elevation of another form of breaking tool for inserting into the hammer head of the piston rod.

Referring to the drawings, particularly to Figures 1 to 5, inclusive, the numeral i0 designates a frame supported by wheels II, and I2. The wheels ii are of a swiveltype. so the front F of the machine may be operated straight ahead or at right angles thereof. The wheels l2 are driven by the diflerential shafts within the axle housing ll, which is rigidly secured to the frame ll, thereby forming the rear support R of the for the air cylinder with its concrete cutting and breaking mechanism to operate and work into narrow places or corner spaces. In this hand push machine, all of the wheels are of the swivel type so the machine may be maneuvered and turned in a very small radius during its working operations. In the motive power machine, only the front wheels are of the swivel type, while the rear wheels are optionally and independently locked by separate band brake levers arranged therewith, so the motive power machine and its air driving and hammering mechanism are movable from left to right, or vice versa, such as may be desired.

Other features of this invention will appear as the description proceeds in the following'speciflcation, accompanied by the annexed drawings. in which Figure 1 is a side elevational view of the pneumatic concrete breaking machine of this invention, which shows a power traction type operated by compressed air.

Figure 2 is a plan view of the same machine shown in Figure 1.

- like line from the fixed wheel set with its band machine. Power means for driving the wheels it is provided by an air compressed motor (or gasoline motor) i5, receiving its fuel supply from any suitable source not shown, the motor having a control lever l6, that operates shaft i6, toothed clutch II, transmissioni8, shaft is and diiierfntial housing 20, secured to the axle housmg l Bank brakes 22 are arranged onto each of the wheels l2 and operate independently of each other by means of levers. 23, link 24, brake lever 25, looking lever 28 into the quadrant 21. This allows both or either one of the brakes 22 to be set at once to hold or turn the machine steady while in operation. The machine operates on a radius of about four and one-half feet, allowing it to cut and break concrete in a width varying from a few inches to nine feet.

To rotate machine, one of the brakes 22 is applied to either of the wheels l2, while the other brake 22 is not applied and that wheel is free to rotate. The motor II is then operated by the lever i6, thereby driving rear end on a radiusbrake 22, whereby the free wheel I: and its caster bracket l2 turns on its swivel bearing 12. for example, at about a right angle, thereby causing the front of the machine to travel in a circular direction around the fixed rear wheel.

The alr valve device it is supplied with compressed air through a hose 8! from any suitable supply source, such as an air compressor (not reciprocating action, taking compressed :air on both sides of thereof. The hand reverse action of the valve device 39 drives the piston 3 upwardly by admitting air into the hose 31 that connects to the lower cylinder head 38.

The cylinder casing at 36 is'fiexibly suspended from the swinging arm 39 of the boom by means of a clevis 42 pivotally connecting at 42 to one end of a bell-crankcam 43 which is pivoted at 44 to the outer end of the arm 39. The bellcrank cam 43 is for raising and lowering the cylinder casing 36, in which a pin 45 looks the cam 43 in the holes 46 of the arm or beam 39, as shown in full lines in Figure 1, and when cam is turned over its pivotal center and locked by the pin 45 in theholes 41, it lowers the cylinder casing 39 as shown in dot and dash lines of the same Figure l.

The arm or beam 39 is an integral and secured part of the mast or post 40 both of which form the boom 40, which swings from left to right as shown in the dot and dash line positions in Figure 2, for reason of the turntable arrangement provided by the plate 50 secured by rivets to the fram ID. The plate 50 has a hole 52 bored in the center thereof, through which the center pin 53 is inserted for operating the swivel bracket or trunnion platemember 54 secured to the end frame member of the main frame I0. The swivel bracket and base plate 54 has extended bracket portions 55 having holes 56 therein to hold a stub-shaft or bolt 51 that provides the pivotal bearing or axis for the mast or post 49 of the boom 40.

The stub-shaft or bolt 51 is keyed to a worm gear 59 that meshes with a worm member 30 mounted onto the bearings 68 secured onto the swivel base plate member 54. The worm shaft 52 has a square shank end 63 that is adaptable to engage a square socket 64 of the rod 35 extending to and through the bearing block 66 onto the rear cross frame member iii. A suitable crank-handle 61 operates the rod 65 when moved forward for the socket 64 to engage the square shank end 33 when it is desired to tilt the boom 40 to its inoperative and horizontal position shown in the dot and dash line position at 1?, in which a suitable clamping member 68 secures the tool-hammer end of the air piston 31 and cylinder casing 36. The braces 10 and 12 are removed from their secured. positions during this tilting operation, and are secured onto the main frame It as desired.

The brace 19 supports the boom assembly 49 rearwardly and forwardly, having its lower end 10" pivotally secured to the rear cross frame member I0 and its upper end ll hooked onto the pin ll secured into the top portion of the mast or post 40 The braces 12 supportlaterally the boom assembly 49, the braces I! having their lower ends 12 pivotally secured at 13 to the side longitudinal member "1 and III, and their upper ends 12 hooked also onto thesame pin II at top of mast or post 40*.

The cylinder casing 36 may or may not have stay-rods 315 to make secure the heads 35 and 38, and is also braced laterally by rod-hooks having one end pivotally secured at 16 to the mast 40 and the other hook ends 11 inserted into the holes l8 of the cylinder lower head flange and piston bearing 38. The hammer head 89 of the piston 31 and the boom assembly 49 are adapted to rotate or oscillate at right angles of about 90 degrees on th e swlvel-base plate 54, as shown in the dot and dash line positions in Figure 2.

The hammer head is secured by pin 88 to the tapered end of the piston rod 31*, and the concrete cutting and breaking tools 82 or 83, or any of the various tools not shown, are similarly secured by a pin 84 to the hammer head 30, clearly shown in Figure 1.

Steering handles 90, may or may not be provided at rear and front of the main frame II], but the operator as shown in dot and dash line position in Figure 1, standing on the floor F or on the floor f (or the floor 1 may be eliminated, if so desired) of the truck frame l0 may turn or maneuver the machine by operating either or both of the brake levers 25 and the motive power control lever Hi.

In operation, the operator manipulates the double acting valve lever 32 forward for driving the hammer head 90 and cutting tool 82 that cuts and breaks the concrete C, in which the piston 31 and rod 31 is driven downwardly in the cylinder 36 by the compressed air released in the valve device 30 through the hose 33 to the upper cylinder head 35. The piston 31' instantly reactuates upwardly by the automatic valve control caused by the lever 32, that simultaneously closes the valve admitting compressed air into the hose 33 and upper cylinder head, and admits the compressed air into the hose 33 at the lower cylinder head 38. The operator pushes forward the hand lever 32 again for the next cutting and breaking operation onto the concrete floor F, and so on. Exhaust pipes and 96 are for the exhausted compressed air from the cylinder 36.

To prevent the boom assembly 49 from being tilted over its vertical center, a removable chain H5 is attached at M6 to the mast-pole member 40, and anchored at H! to the cross-frame member W Also suitable means for turning the boom assembly 49 as may be desired, such as for example, by a removable rod H0 inserted through a small lug bracket ill secured to the mast-pole 40 about three from the floor F. When not in use, the rod is removed from bracket and placed onto rear floor f of machine, wherein other tools may be kept for use on the machine.

The foregoing is a description of the power propelled concrete breaking machine of this invention, however, the same described machine may be embodied in a hand pushed machine HPM, such as shown and illustrated in Figures '7 and 8, in which all the motive power equipment has been eliminated. Otherwise there is a general similarity of the original power machine PM and the hand push type machine HPM, therefore, all similar parts in Figures 7 and 8 will be designated by the same numeral primed accordingly. I

Further features are embodied in this hand push type HPM, such as the frame side member lll and I9" converge into an apexed front point-like front portion AF, allowing the cylinder 3B and tool 82' to work in narrow corner or spaces. Also all of the four'wheels H and II are of a swivel type, the rear wheels l2 may or may. not be provided with steering handles 90' for setting the wheels at right angles as shown while the front wheels II and in the dot and dash line position in Figure '1, so machine may become more steady in operation. The wheels I2 and I2 are of the pneumatic type, to provide a spring-like action for the frame I during the vibration and hammering blows of the piston 36 and tools 82 and 80, II' may be of a more solid type.

A rear folding tool table or extended floor member I00 is carried by the rear frame member I0 and has legs l0l that fold on pivots I02,

- as shown in the dot and dash lines in Figure 6,

when the 'table is folded on the hinges I03.

The mast 40" in this type is rigid and not turnable, for reason the four swivel wheels II and I2 provide for the swinging around of the front apexed frame portion AF. Also the cylinder assembly is additionally braced vertically by the tum-buckle I05 and thread rods I00, I01, that are secured as shown onto the front frame member I0 and the lower cylinder head 38, respectively. This assists in firmly steadying the loosely suspended cylinders 36, 36, during the repeated hammer blows of the cutting tool 82 or head 00 onto the concrete floor F. Further means to lock the boom 40 in its working position may be adopted other than the locked ear 59 and worm 80, if so desired.

It is to be-understood that I do not confine myself to the exactness of any detail shown in the drawings and as hereinbefore "described, which merely illustrates the principle of operations of this invention, and hereby reserve all right to alter and improve any part thereof,providing same comes within the spirit of this in,- vention and the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is as follows:

1. In a cutting and breaking machine, in combination, a main frame forming a chassis, wheels supporting said frame, a substantially vertical boom rotatably mounted on said frame adjacent to one end thereof, a substantially horizontal arm secured to said boom and having one end extended beyond said last mentioned end of said frame, an air controlled cylinder depending from said extended .end of said arm, bracing means spaced apart from said arm and engaging said cylinder and said boom for steadying said cylinder, a piston reciprocatively mounted in said cylinder, a piston 'rod connected to said piston and adapted to carry a tool, means on said frame for controlling the delivery of air to the ends of said cylinder for reciprocating said piston, and means on said frame for partially rotating said boom and thereby swinging said cylinder through an arcuate path.

2. In a portable cutting and breaking machine, in combination, a main frame forming a chassis, wheels supporting said frame, a vertical boom adjacent to one end and having its lower and engaging said frame, a plurality of inclined rigid bracing members secured to said frame and terminating in an apex engaged by the upper end of'said boom, a substantially horizontal arm secured to said boom and having one end extended beyond said last-mentioned end of said frame, an air controlled cylinder depending from the extended end of said arm, a bracing member below and spaced apart from said arm and engaging said cylinder and said boom; said arm, cylinder, bracing member, and a portion of said boom forming a parallelogram, a piston in said cylinder, a piston rod carried thereby and adaptrear portions of said main frame, all of said wheels being of a swivel type, each of said pair of rear wheels provided with a steering handle, the front portion of said main frame converging into an apexed front portion provided with a boom assembly, an air cylinder casing suspended on said boom assembly, said cylinder casing having a reciprocating piston therein and a pistonrod extending therefrom, said piston-rod having a concrete breaking member secured to its outer free end, an air valve controlling device arranged on said main frame, said device having a pair of hose lines, one of which connects to the upper head portion and the other connecting to the lower head portion of said cylinder casing, said device being adaptable to close said compressed air line connection to said upper head portion of cylinder and to admit compressed air through said other hose line to said lower head portion of said cylinder to reciprocate said piston.

4. In a portable cutting and breaking machine, in combination, a main frame forming a chassis, wheels supporting said frame, a vertical boom adjacent one end of said frame and having its lower vend rigidly secured thereto, supporting means rigidly secured to said frame and to said boom and comprised of a plurality of members extending angularly fromthe top of said boom to points adjacent the opposite end of said frame, a horizontal arm rigidly secured to said boom and having one end extending beyond said firstmentioned end of said frame, and an air hammer suspended from said arm and adapted to freely operate in an area beyond said first-mentioned end of said frame.

5. In a portable cutting and breaking machine, a main frame forming a chassis, wheels supporting said frame, a vertical boom mounted on said frame adjacent to one end thereof, a substantially horizontal arm secured to said boom and ing said frame, a vertical boom mounted on said frame adjacent to one end thereof, a substantially horizontal arm secured to said boom and.

having one end extending beyond said last-mentioned end of said frame, an air controlled cylinder depending from said arm and having its vertical axis spaced apart from said last, end of said frame, a bracing member engaging the lower end of said cylinder and pivotally connected to said boom for steadying said cylinder, a piston mounted in said cylinder and adapted to carry a tool, and means on said frame for controlling the delivery of air to and from the ends of said cylinder.

WALTER V. CORNE'IT. 

